47 research outputs found
Higher order anisotropies in the Buda-Lund model: Disentangling flow and density field anisotropies
The Buda-Lund hydro model describes an expanding ellipsoidal fireball, and
fits the observed elliptic flow and oscillating HBT radii successfully. Due to
fluctuations in energy depositions, the fireball shape however fluctuates on an
event-by-event basis. The transverse plane asymmetry can be translated into a
series of multipole anisotropy coefficients. These anisotropies then result in
measurable momentum-space anisotropies, to be measured with respect to their
respective symmetry planes. In this paper we detail an extension of the
Buda-Lund model to multipole anisotropies and investigate the resulting flow
coefficients and oscillations of HBT radii.Comment: 1 column format, 20 pages, 10 figure
HBT radii from the multipole Buda-Lund model
The Buda-Lund model describes an expanding hydrodynamical system with
ellipsoidal symmetry and fits the observed elliptic flow and oscillating HBT
radii successfully. The ellipsoidal symmetry can be characterized by the second
order harmonics of the transverse momentum distribution, and it can be also
observed in the azimuthal oscillation of the HBT radii measured versus the
second order reaction plane. The model may have to be changed to describe the
experimentally indicated higher order asymmetries. In this paper we detail an
extension of the Buda-Lund hydro model to investigate higher order flow
harmonics and the triangular dependence of the azimuthally sensitive HBT radii.Comment: 4 pages, 6 figures. Presented at the 11th Workshop on Particle
Correlations and Femtoscopy (WPCF 2015), 03-07 Nov 2015, Warsaw, Polan
Reconstructing the Source in Heavy Ion Collisions from Particle Interferometry
The preliminary CERN SPS NA49 Pb+Pb 158 GeV/A negative one- and two-particle
spectra at mid-rapidity are consistent with a source of temperature 130 MeV,
lifetime 9 fm/c, transverse flow 0.35, and a transverse geometric size which is
twice as large as the cold Pb nucleus.Comment: Proceedings for Quark Matter 97; 4 pages, 2 eps-figure
Dynamics and Sizes of the Fireball at Freeze-out
Analyzing the m_t-spectrum and two-particle correlations of negative hadrons
from 158 AGeV/c Pb+Pb collisions at slightly forward rapidities we find a
(thermal) freeze-out temperature of about 100 MeV and transverse flow with
approximately 0.55c. The M_t-dependence of the correlation radii prefers
a box-like transverse density profile over a Gaussian. From an analysis of the
pion phase-space density we find pion chemical potential of approximately 60
MeV at thermal freeze-out.Comment: Contribution to the XVth Particle and Nuclei International
Conference, PANIC'99, Uppsala June, 10-16, 1999; 4 pages, 2 figures, needs
Elsevier style file espcrc1.sty (provided